Treatment tool

Abstract

A treatment tool includes: a first jaw; a second jaw that is openable and closable relative to the first jaw; a grasping member that is supported by the second jaw so as to be rotatable about a first rotation axis from a first state to a second state, and grasps living tissue in a space formed with the first jaw; and a regulating member that regulates rotation of the grasping member with respect to the second jaw to set the grasping member to one of the first state and the second state in a state in which the second jaw is opened with respect to the first jaw. The regulating member is a magnetic member that regulates rotation of the grasping member with respect to the second jaw by a magnetic force, and regulation of rotation of the grasping member is released when the living tissue is grasped.

What is claimed is: 
     
         1 . A treatment tool comprising:
 a first jaw;   a second jaw that is configured to open and close relative to the first jaw;   a grasping member that is supported by the second jaw such that the grasping member is rotatable about a first rotation axis from a first state to a second state, and the grasping member grasps living tissue in a space formed with the first jaw; and   a regulating member that regulates rotation of the grasping member with respect to the second jaw to set the grasping member to one of the first state or the second state when the second jaw is open with respect to the first jaw, wherein:   in the first state, a first region of the grasping member contacts the second jaw and a second region of the grasping member is separated from the second jaw, the first region being located between the first rotation axis and a distal end of the grasping member, the second region being located between the first rotation axis and a proximal end of the grasping member,   in the second state, the second region comes into contact with the second jaw and the first region is separated from the second jaw,   the regulating member is a magnetic member that regulates rotation of the grasping member with respect to the second jaw by a magnetic force, and   regulation of rotation of the grasping member by the regulating member is released when the living tissue is grasped between the first jaw and the grasping member.   
     
     
         2 . The treatment tool according to  claim 1 , wherein:
 the regulating member is arranged between the first rotation axis and a proximal end of the treatment tool, and   the regulating member sets the grasping member to the second state when the second jaw is opened with respect to the first jaw.   
     
     
         3 . The treatment tool according to  claim 1 , wherein:
 the regulating member is arranged between the first rotation axis and a distal end of the treatment tool, and   the regulating member sets the grasping member to the first state when the second jaw is opened with respect to the first jaw.   
     
     
         4 . The treatment tool according to  claim 1 , wherein the regulating member is arranged on at least one of the second jaw and the grasping member, in a region in which the second jaw contacts the grasping member in one of the first state and the second state. 
     
     
         5 . The treatment tool according to  claim 1 , the regulating member including:
 a sliding member that is configured to move towards the grasping member when the second jaw opens with respect to the first jaw, the sliding jaw being configured to move in a direction away from the grasping member when the second jaw closes with respect to the first jaw, wherein:   the sliding member is configured to regulate rotation of the grasping member with respect to the second jaw by contacting the grasping member when the second jaw is opened with respect to the first jaw.   
     
     
         6 . The treatment tool according to  claim 5 , wherein the second jaw includes a guide groove that guides movement of the sliding member. 
     
     
         7 . The treatment tool according to  claim 5 , further comprising:
 a support member that supports the first jaw, wherein:   the second jaw is supported by the support member so that the second jaw is configured to rotate about a second rotation axis, and the second jaw opens and closes with respect to the first jaw by rotating about the second rotation axis,   the regulating member includes a link that is supported by the support member so that the regulating member is configured to rotate about a third rotation axis parallel to the second rotation axis, and that is connected to the sliding member, and   the link rotates with respect to the support member when the second jaw opens and closes with respect to the first jaw.